CVE-2025-2864 in saTECH BCU
Summary
by MITRE • 03/28/2025
SaTECH BCU in its firmware version 2.1.3 allows an attacker to inject malicious code into the legitimate website owning the affected device, once the cookie is set. This attack only impacts the victim's browser (reflected XSS).
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Analysis
by VulDB Data Team • 10/10/2025
The vulnerability identified as CVE-2025-2864 affects SaTECH BCU devices running firmware version 2.1.3, presenting a reflected cross-site scripting flaw that enables remote code execution within victim browsers. This security weakness stems from insufficient input validation and output encoding mechanisms within the device's web interface implementation. The vulnerability specifically manifests when an attacker crafts malicious URLs containing crafted payloads that get reflected back to the victim's browser through improperly sanitized cookie values. The reflected XSS occurs because the device fails to properly sanitize user-supplied data before incorporating it into web responses, creating an attack surface where malicious scripts can be executed in the context of the victim's browser session.
The technical exploitation of this vulnerability follows a typical reflected XSS attack pattern where an attacker crafts a malicious URL containing script payloads that are then reflected back to the victim when they click on the link or visit the malicious page. The cookie-based attack vector represents a sophisticated approach that leverages session management weaknesses within the device's authentication mechanism. When the victim's browser processes the malicious cookie value, the embedded scripts execute within the context of the legitimate website, potentially allowing attackers to steal session cookies, redirect users to malicious sites, or perform actions on behalf of the authenticated user. This attack model aligns with CWE-79 which categorizes cross-site scripting vulnerabilities as a result of insufficient input validation and output encoding.
The operational impact of CVE-2025-2864 extends beyond simple script execution as it enables attackers to compromise the integrity of the victim's browser session and potentially escalate privileges within the device's administrative interface. The reflected nature of the vulnerability means that attackers need to convince victims to click on malicious links rather than having persistent access, but this still represents a significant threat vector for social engineering attacks. The vulnerability affects only the victim's browser environment rather than the device itself, but this does not diminish its severity as it can lead to complete session hijacking and unauthorized administrative access. The attack requires minimal privileges on the device itself, making it particularly dangerous as it can be exploited without requiring direct network access to the device's management interfaces.
Mitigation strategies for CVE-2025-2864 should focus on implementing robust input validation and output encoding mechanisms within the device's web interface. The most effective immediate solution involves updating the firmware to a version that properly sanitizes all user-supplied inputs and implements proper HTTP response encoding for all dynamic content. Network administrators should implement strict access controls and monitor for suspicious cookie values in web traffic logs. The implementation of Content Security Policy headers can provide additional protection against reflected XSS attacks by restricting script execution sources. Security monitoring should include detection of malformed cookie values and unusual patterns in web requests that may indicate exploitation attempts. Organizations should also consider implementing web application firewalls to filter malicious payloads before they reach the vulnerable device. This vulnerability demonstrates the importance of following secure coding practices and adheres to ATT&CK technique T1212 which covers data manipulation through web application vulnerabilities, emphasizing the need for comprehensive security testing of network device interfaces and the implementation of proper input validation mechanisms as outlined in the OWASP Top Ten security framework.